Aqueous dispersion and method of use

Abstract

This invention relates generally to the use, for example in the cosmetics field and in particular for the treatment and styling of the hair, of an aqueous dispersion of particles of the nucleus/casing (core/shell) type containing compounds with reactive silyl functions, as well as to a process for treatment and a process for styling of the hair using such an aqueous dispersion. The dispersions and particles also make up a part of this invention, as do their methods of manufacture.

1 . A method for treating human keratinous fibers, comprising applying thereto an aqueous dispersion of particles having a nucleus/casing structure, wherein said casing comprises an acrylic polymer, and wherein the nucleus comprises a compound having a reactive silyl function.  
     
     
         2 . The method according to  claim 1 , wherein said fibers are hair.  
     
     
         3 . The method according to  claim 1 , wherein the compound having a reactive silyl function is selected from the group of compounds having formula (I):  
       
         
           
           
               
               
           
         
       
       in which 
 R 1  represents a polymeric residue or an R 3  group,  
 R 2  represents a C 1-8  alcoxy group,  
 R 3  represents a linear, branched or cyclic C 1-8  alkyl group,  
 X represents a hydrogen atom or a cation of a base used for the neutralization of silanol groups,  
 m represents a whole number ranging from 0 to 3,  
 q has the value of 0 or 1,  
 n and p each represent a whole number ranging from 0 to 4,  
 the sum of n+p has the value of 1, 2, 3 or 4, and  
 the sum of m+n+p+q has the value of 4.  
 
     
     
         4 . The method according to  claim 3 , wherein R 3  represents a methyl or ethyl group.  
     
     
         5 . The method according to  claim 3 , wherein R 2  represents a methoxy or ethoxy group.  
     
     
         6 . The method according to  claim 1 , wherein said acrylic polymer is anionic, essentially insoluble in water, and comprises polymerized moieties of acrylic acid and/or methacrylic acid neutralized by a base.  
     
     
         7 . The method according to  claim 3 , wherein R 1  denotes an anionic acrylic polymeric residue.  
     
     
         8 . The method according to  claim 1 , wherein a mean size of the particles is from 10 nm to 1000 nm.  
     
     
         9 . The method according to  claim 1 , wherein the concentration of particles in the dispersion is from 1% to 80% by weight, in relation to the total weight of the dispersion.  
     
     
         10 . An aqueous dispersion of particles having a nucleus/casing structure, wherein the casing comprises an acrylic polymer insoluble in water, and the nucleus comprises a compound having a reactive silyl function and one or more hydrosoluble polymers.  
     
     
         11 . The dispersion according to  claim 10 , wherein the concentration of hydrosoluble polymer or polymers ranges between 0.01 and 30% by weight in relation to the total weight of the composition.  
     
     
         12 . The dispersion according to  claim 10 , having a pH in excess of or equal to 5.  
     
     
         13 . The dispersion according to  claim 10 , further comprising a cosmetic hair styling and care additive.  
     
     
         14 . A process for the cosmetic treatment of human keratinous fibers, comprising 
 applying an aqueous dispersion of particles having a nucleus/casing structure, wherein said casing comprises an acrylic polymer, and wherein the nucleus comprises a compound having a reactive silyl function to dry or dampened fibers to produce coated fibers, and    drying the coated fibers at room temperature or by applying heat.    
     
     
         15 . The process of  claim 14 , wherein said aqueous dispersion is applied before or after a coloring, color stripping, perming or straightening treatment.  
     
     
         16 . A process according to  claim 14 , comprising: 
 applying an aqueous dispersion of particles having a nucleus/casing structure, wherein said casing comprises an acrylic polymer, and wherein the nucleus comprises a compound having a reactive silyl function to dry or dampened hair to produce coated fibers,    arranging the coated fibers, and    drying the coated fibers at room temperature or by applying heat.    
     
     
         17 . A process for the cosmetic treatment of human keratinous fibers, comprising 
 applying an aqueous dispersion of particles having a nucleus/casing structure, wherein the casing comprises an acrylic polymer insoluble in water, and the nucleus comprises a compound having a reactive silyl function and one or more hydrosoluble polymers to dry or dampened fibers to produce coated fibers, and    drying the coated fibers at room temperature or by applying heat.    
     
     
         18 . The process of  claim 17 , wherein said aqueous dispersion is applied before or after a coloring, color stripping, perming or straightening treatment.  
     
     
         19 . A process according to  claim 17 , comprising: 
 applying an aqueous dispersion of particles having a nucleus/casing structure, wherein the casing comprises an acrylic polymer insoluble in water, and the nucleus comprises a compound having a reactive silyl function and one or more hydrosoluble polymers to dry or dampened hair to produce coated fibers,    arranging the coated fibers, and    drying the coated fibers at room temperature or by applying heat.